A mistake was just discovered in The Empire Strikes Back — here are other notable goofs and errors from the original Star Wars movies

3 of 5

SYDNEY, AUSTRALIA – JUNE 27: Toy light sabers ar eseen at the Sons of Obiwan Saber Academy on June 27, 2017 in Sydney, Australia. The Sons of Obiwan Saber Academy is a volunteer organisation of Star Wars fans who use stage combat as a way to promote fun, fitness and education. The Australian designed and manufactured lightsabers used in classes are made from aluminium with poly-carbonate blades. (Photo by Mark Kolbe/Getty Images)

Wired lightsaber

The lightsaber battle between Darth Vader and Obi-Wan Kenobi in A New Hope is one of the iconic moments in the movie — a fight full of revenge and bitterness.

And for “Old Ben,” a chance to sacrifice himself to help his friends.

“Your powers are weak, old man,” Vader tells Obi-Wan during the battle.

Just don’t tell him his lightsaber is weak — he has the cord to prove it.

At the beginning of the battle, the wire to Obi-Wan’s lightsaber is visible and can be seen running up his sleeve.

Lightsaber technology has come a long way since the 1970s.

But for Obi-Wan’s battle, that technology was still in its infancy.

“The effect of the lightsaber was basically a rotating pole that had movie screen material applied to it so that it would reflect its light source back at many times the intensity. The problem was that when you moved it out of a certain area, it went from glowing and looking great to just a rotating pole,” Mark Hamill said in an interview for “Star Wars Featurette: The Birth of the Lightsaber,” which was included in the 2004 Star Wars original trilogy DVD and published on YouTube in 2014.